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Advances in High Energy Physics
Volume 2014 (2014), Article ID 891820, 8 pages
Research Article

Dark Photon Searches Using Displaced Vertices at Low Energy Colliders

Laboratori Nazionali dell’INFN, Via E. Fermi 40, 00044 Frascati, Rome, Italy

Received 26 November 2013; Accepted 29 January 2014; Published 11 March 2014

Academic Editor: Jean-René Cudell

Copyright © 2014 Fabio Bossi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.


The existence of a new, photon-like, massive particle, the or dark photon, is postulated in several extensions of the Standard Model. These models are often advocated to explain some recent puzzling astrophysical observations, as well as to solve the so far unexplained deviation between the measured and calculated values of the muon anomaly. Dark photons can be produced at colliders both in continuum events and in vector meson transitions and can eventually decay into an electron-positron pair. For a proper choice of the parameters of the theory, a can have a relatively long lifetime and can therefore be observed as an vertex well separated by the primary interaction point. This case is discussed in reference to very high luminosity colliders either in construction or under study in several laboratories in the world. It is shown that a search strategy based on the detection of displaced vertices can be in principle very effective in covering a rather wide and to date unexplored region of the theoretical parameters space.